IPv6: Print error value when skb allocation fails
[linux-2.6] / net / ipv6 / af_inet6.c
1 /*
2  *      PF_INET6 socket protocol family
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *
8  *      Adapted from linux/net/ipv4/af_inet.c
9  *
10  *      Fixes:
11  *      piggy, Karl Knutson     :       Socket protocol table
12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
14  *
15  *      This program is free software; you can redistribute it and/or
16  *      modify it under the terms of the GNU General Public License
17  *      as published by the Free Software Foundation; either version
18  *      2 of the License, or (at your option) any later version.
19  */
20
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/in.h>
28 #include <linux/kernel.h>
29 #include <linux/timer.h>
30 #include <linux/string.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/fcntl.h>
34 #include <linux/mm.h>
35 #include <linux/interrupt.h>
36 #include <linux/proc_fs.h>
37 #include <linux/stat.h>
38 #include <linux/init.h>
39
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/icmpv6.h>
43 #include <linux/netfilter_ipv6.h>
44
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/udp.h>
48 #include <net/udplite.h>
49 #include <net/tcp.h>
50 #include <net/ipip.h>
51 #include <net/protocol.h>
52 #include <net/inet_common.h>
53 #include <net/route.h>
54 #include <net/transp_v6.h>
55 #include <net/ip6_route.h>
56 #include <net/addrconf.h>
57 #ifdef CONFIG_IPV6_TUNNEL
58 #include <net/ip6_tunnel.h>
59 #endif
60
61 #include <asm/uaccess.h>
62 #include <asm/system.h>
63 #include <linux/mroute6.h>
64
65 MODULE_AUTHOR("Cast of dozens");
66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
67 MODULE_LICENSE("GPL");
68
69 /* The inetsw6 table contains everything that inet6_create needs to
70  * build a new socket.
71  */
72 static struct list_head inetsw6[SOCK_MAX];
73 static DEFINE_SPINLOCK(inetsw6_lock);
74
75 struct ipv6_params ipv6_defaults = {
76         .disable_ipv6 = 0,
77         .autoconf = 1,
78 };
79
80 static int disable_ipv6_mod = 0;
81
82 module_param_named(disable, disable_ipv6_mod, int, 0444);
83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
84
85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
87
88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
90
91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
92 {
93         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
94
95         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
96 }
97
98 static int inet6_create(struct net *net, struct socket *sock, int protocol)
99 {
100         struct inet_sock *inet;
101         struct ipv6_pinfo *np;
102         struct sock *sk;
103         struct inet_protosw *answer;
104         struct proto *answer_prot;
105         unsigned char answer_flags;
106         char answer_no_check;
107         int try_loading_module = 0;
108         int err;
109
110         if (sock->type != SOCK_RAW &&
111             sock->type != SOCK_DGRAM &&
112             !inet_ehash_secret)
113                 build_ehash_secret();
114
115         /* Look for the requested type/protocol pair. */
116 lookup_protocol:
117         err = -ESOCKTNOSUPPORT;
118         rcu_read_lock();
119         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
120
121                 err = 0;
122                 /* Check the non-wild match. */
123                 if (protocol == answer->protocol) {
124                         if (protocol != IPPROTO_IP)
125                                 break;
126                 } else {
127                         /* Check for the two wild cases. */
128                         if (IPPROTO_IP == protocol) {
129                                 protocol = answer->protocol;
130                                 break;
131                         }
132                         if (IPPROTO_IP == answer->protocol)
133                                 break;
134                 }
135                 err = -EPROTONOSUPPORT;
136         }
137
138         if (err) {
139                 if (try_loading_module < 2) {
140                         rcu_read_unlock();
141                         /*
142                          * Be more specific, e.g. net-pf-10-proto-132-type-1
143                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
144                          */
145                         if (++try_loading_module == 1)
146                                 request_module("net-pf-%d-proto-%d-type-%d",
147                                                 PF_INET6, protocol, sock->type);
148                         /*
149                          * Fall back to generic, e.g. net-pf-10-proto-132
150                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
151                          */
152                         else
153                                 request_module("net-pf-%d-proto-%d",
154                                                 PF_INET6, protocol);
155                         goto lookup_protocol;
156                 } else
157                         goto out_rcu_unlock;
158         }
159
160         err = -EPERM;
161         if (answer->capability > 0 && !capable(answer->capability))
162                 goto out_rcu_unlock;
163
164         sock->ops = answer->ops;
165         answer_prot = answer->prot;
166         answer_no_check = answer->no_check;
167         answer_flags = answer->flags;
168         rcu_read_unlock();
169
170         WARN_ON(answer_prot->slab == NULL);
171
172         err = -ENOBUFS;
173         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
174         if (sk == NULL)
175                 goto out;
176
177         sock_init_data(sock, sk);
178
179         err = 0;
180         sk->sk_no_check = answer_no_check;
181         if (INET_PROTOSW_REUSE & answer_flags)
182                 sk->sk_reuse = 1;
183
184         inet = inet_sk(sk);
185         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
186
187         if (SOCK_RAW == sock->type) {
188                 inet->num = protocol;
189                 if (IPPROTO_RAW == protocol)
190                         inet->hdrincl = 1;
191         }
192
193         sk->sk_destruct         = inet_sock_destruct;
194         sk->sk_family           = PF_INET6;
195         sk->sk_protocol         = protocol;
196
197         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
198
199         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
200         np->hop_limit   = -1;
201         np->mcast_hops  = -1;
202         np->mc_loop     = 1;
203         np->pmtudisc    = IPV6_PMTUDISC_WANT;
204         np->ipv6only    = net->ipv6.sysctl.bindv6only;
205
206         /* Init the ipv4 part of the socket since we can have sockets
207          * using v6 API for ipv4.
208          */
209         inet->uc_ttl    = -1;
210
211         inet->mc_loop   = 1;
212         inet->mc_ttl    = 1;
213         inet->mc_index  = 0;
214         inet->mc_list   = NULL;
215
216         if (ipv4_config.no_pmtu_disc)
217                 inet->pmtudisc = IP_PMTUDISC_DONT;
218         else
219                 inet->pmtudisc = IP_PMTUDISC_WANT;
220         /*
221          * Increment only the relevant sk_prot->socks debug field, this changes
222          * the previous behaviour of incrementing both the equivalent to
223          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
224          *
225          * This allows better debug granularity as we'll know exactly how many
226          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
227          * transport protocol socks. -acme
228          */
229         sk_refcnt_debug_inc(sk);
230
231         if (inet->num) {
232                 /* It assumes that any protocol which allows
233                  * the user to assign a number at socket
234                  * creation time automatically shares.
235                  */
236                 inet->sport = htons(inet->num);
237                 sk->sk_prot->hash(sk);
238         }
239         if (sk->sk_prot->init) {
240                 err = sk->sk_prot->init(sk);
241                 if (err) {
242                         sk_common_release(sk);
243                         goto out;
244                 }
245         }
246 out:
247         return err;
248 out_rcu_unlock:
249         rcu_read_unlock();
250         goto out;
251 }
252
253
254 /* bind for INET6 API */
255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
256 {
257         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
258         struct sock *sk = sock->sk;
259         struct inet_sock *inet = inet_sk(sk);
260         struct ipv6_pinfo *np = inet6_sk(sk);
261         struct net *net = sock_net(sk);
262         __be32 v4addr = 0;
263         unsigned short snum;
264         int addr_type = 0;
265         int err = 0;
266
267         /* If the socket has its own bind function then use it. */
268         if (sk->sk_prot->bind)
269                 return sk->sk_prot->bind(sk, uaddr, addr_len);
270
271         if (addr_len < SIN6_LEN_RFC2133)
272                 return -EINVAL;
273         addr_type = ipv6_addr_type(&addr->sin6_addr);
274         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
275                 return -EINVAL;
276
277         snum = ntohs(addr->sin6_port);
278         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
279                 return -EACCES;
280
281         lock_sock(sk);
282
283         /* Check these errors (active socket, double bind). */
284         if (sk->sk_state != TCP_CLOSE || inet->num) {
285                 err = -EINVAL;
286                 goto out;
287         }
288
289         /* Check if the address belongs to the host. */
290         if (addr_type == IPV6_ADDR_MAPPED) {
291                 int chk_addr_ret;
292
293                 /* Binding to v4-mapped address on a v6-only socket
294                  * makes no sense
295                  */
296                 if (np->ipv6only) {
297                         err = -EINVAL;
298                         goto out;
299                 }
300
301                 /* Reproduce AF_INET checks to make the bindings consitant */
302                 v4addr = addr->sin6_addr.s6_addr32[3];
303                 chk_addr_ret = inet_addr_type(net, v4addr);
304                 if (!sysctl_ip_nonlocal_bind &&
305                     !(inet->freebind || inet->transparent) &&
306                     v4addr != htonl(INADDR_ANY) &&
307                     chk_addr_ret != RTN_LOCAL &&
308                     chk_addr_ret != RTN_MULTICAST &&
309                     chk_addr_ret != RTN_BROADCAST)
310                         goto out;
311         } else {
312                 if (addr_type != IPV6_ADDR_ANY) {
313                         struct net_device *dev = NULL;
314
315                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
316                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
317                                     addr->sin6_scope_id) {
318                                         /* Override any existing binding, if another one
319                                          * is supplied by user.
320                                          */
321                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
322                                 }
323
324                                 /* Binding to link-local address requires an interface */
325                                 if (!sk->sk_bound_dev_if) {
326                                         err = -EINVAL;
327                                         goto out;
328                                 }
329                                 dev = dev_get_by_index(net, sk->sk_bound_dev_if);
330                                 if (!dev) {
331                                         err = -ENODEV;
332                                         goto out;
333                                 }
334                         }
335
336                         /* ipv4 addr of the socket is invalid.  Only the
337                          * unspecified and mapped address have a v4 equivalent.
338                          */
339                         v4addr = LOOPBACK4_IPV6;
340                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
341                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
342                                                    dev, 0)) {
343                                         if (dev)
344                                                 dev_put(dev);
345                                         err = -EADDRNOTAVAIL;
346                                         goto out;
347                                 }
348                         }
349                         if (dev)
350                                 dev_put(dev);
351                 }
352         }
353
354         inet->rcv_saddr = v4addr;
355         inet->saddr = v4addr;
356
357         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
358
359         if (!(addr_type & IPV6_ADDR_MULTICAST))
360                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
361
362         /* Make sure we are allowed to bind here. */
363         if (sk->sk_prot->get_port(sk, snum)) {
364                 inet_reset_saddr(sk);
365                 err = -EADDRINUSE;
366                 goto out;
367         }
368
369         if (addr_type != IPV6_ADDR_ANY) {
370                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
371                 if (addr_type != IPV6_ADDR_MAPPED)
372                         np->ipv6only = 1;
373         }
374         if (snum)
375                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
376         inet->sport = htons(inet->num);
377         inet->dport = 0;
378         inet->daddr = 0;
379 out:
380         release_sock(sk);
381         return err;
382 }
383
384 EXPORT_SYMBOL(inet6_bind);
385
386 int inet6_release(struct socket *sock)
387 {
388         struct sock *sk = sock->sk;
389
390         if (sk == NULL)
391                 return -EINVAL;
392
393         /* Free mc lists */
394         ipv6_sock_mc_close(sk);
395
396         /* Free ac lists */
397         ipv6_sock_ac_close(sk);
398
399         return inet_release(sock);
400 }
401
402 EXPORT_SYMBOL(inet6_release);
403
404 void inet6_destroy_sock(struct sock *sk)
405 {
406         struct ipv6_pinfo *np = inet6_sk(sk);
407         struct sk_buff *skb;
408         struct ipv6_txoptions *opt;
409
410         /* Release rx options */
411
412         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
413                 kfree_skb(skb);
414
415         /* Free flowlabels */
416         fl6_free_socklist(sk);
417
418         /* Free tx options */
419
420         if ((opt = xchg(&np->opt, NULL)) != NULL)
421                 sock_kfree_s(sk, opt, opt->tot_len);
422 }
423
424 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
425
426 /*
427  *      This does both peername and sockname.
428  */
429
430 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
431                  int *uaddr_len, int peer)
432 {
433         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
434         struct sock *sk = sock->sk;
435         struct inet_sock *inet = inet_sk(sk);
436         struct ipv6_pinfo *np = inet6_sk(sk);
437
438         sin->sin6_family = AF_INET6;
439         sin->sin6_flowinfo = 0;
440         sin->sin6_scope_id = 0;
441         if (peer) {
442                 if (!inet->dport)
443                         return -ENOTCONN;
444                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
445                     peer == 1)
446                         return -ENOTCONN;
447                 sin->sin6_port = inet->dport;
448                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
449                 if (np->sndflow)
450                         sin->sin6_flowinfo = np->flow_label;
451         } else {
452                 if (ipv6_addr_any(&np->rcv_saddr))
453                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
454                 else
455                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
456
457                 sin->sin6_port = inet->sport;
458         }
459         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
460                 sin->sin6_scope_id = sk->sk_bound_dev_if;
461         *uaddr_len = sizeof(*sin);
462         return(0);
463 }
464
465 EXPORT_SYMBOL(inet6_getname);
466
467 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
468 {
469         struct sock *sk = sock->sk;
470         struct net *net = sock_net(sk);
471
472         switch(cmd)
473         {
474         case SIOCGSTAMP:
475                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
476
477         case SIOCGSTAMPNS:
478                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
479
480         case SIOCADDRT:
481         case SIOCDELRT:
482
483                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
484
485         case SIOCSIFADDR:
486                 return addrconf_add_ifaddr(net, (void __user *) arg);
487         case SIOCDIFADDR:
488                 return addrconf_del_ifaddr(net, (void __user *) arg);
489         case SIOCSIFDSTADDR:
490                 return addrconf_set_dstaddr(net, (void __user *) arg);
491         default:
492                 if (!sk->sk_prot->ioctl)
493                         return -ENOIOCTLCMD;
494                 return sk->sk_prot->ioctl(sk, cmd, arg);
495         }
496         /*NOTREACHED*/
497         return(0);
498 }
499
500 EXPORT_SYMBOL(inet6_ioctl);
501
502 const struct proto_ops inet6_stream_ops = {
503         .family            = PF_INET6,
504         .owner             = THIS_MODULE,
505         .release           = inet6_release,
506         .bind              = inet6_bind,
507         .connect           = inet_stream_connect,       /* ok           */
508         .socketpair        = sock_no_socketpair,        /* a do nothing */
509         .accept            = inet_accept,               /* ok           */
510         .getname           = inet6_getname,
511         .poll              = tcp_poll,                  /* ok           */
512         .ioctl             = inet6_ioctl,               /* must change  */
513         .listen            = inet_listen,               /* ok           */
514         .shutdown          = inet_shutdown,             /* ok           */
515         .setsockopt        = sock_common_setsockopt,    /* ok           */
516         .getsockopt        = sock_common_getsockopt,    /* ok           */
517         .sendmsg           = tcp_sendmsg,               /* ok           */
518         .recvmsg           = sock_common_recvmsg,       /* ok           */
519         .mmap              = sock_no_mmap,
520         .sendpage          = tcp_sendpage,
521         .splice_read       = tcp_splice_read,
522 #ifdef CONFIG_COMPAT
523         .compat_setsockopt = compat_sock_common_setsockopt,
524         .compat_getsockopt = compat_sock_common_getsockopt,
525 #endif
526 };
527
528 const struct proto_ops inet6_dgram_ops = {
529         .family            = PF_INET6,
530         .owner             = THIS_MODULE,
531         .release           = inet6_release,
532         .bind              = inet6_bind,
533         .connect           = inet_dgram_connect,        /* ok           */
534         .socketpair        = sock_no_socketpair,        /* a do nothing */
535         .accept            = sock_no_accept,            /* a do nothing */
536         .getname           = inet6_getname,
537         .poll              = udp_poll,                  /* ok           */
538         .ioctl             = inet6_ioctl,               /* must change  */
539         .listen            = sock_no_listen,            /* ok           */
540         .shutdown          = inet_shutdown,             /* ok           */
541         .setsockopt        = sock_common_setsockopt,    /* ok           */
542         .getsockopt        = sock_common_getsockopt,    /* ok           */
543         .sendmsg           = inet_sendmsg,              /* ok           */
544         .recvmsg           = sock_common_recvmsg,       /* ok           */
545         .mmap              = sock_no_mmap,
546         .sendpage          = sock_no_sendpage,
547 #ifdef CONFIG_COMPAT
548         .compat_setsockopt = compat_sock_common_setsockopt,
549         .compat_getsockopt = compat_sock_common_getsockopt,
550 #endif
551 };
552
553 static struct net_proto_family inet6_family_ops = {
554         .family = PF_INET6,
555         .create = inet6_create,
556         .owner  = THIS_MODULE,
557 };
558
559 int inet6_register_protosw(struct inet_protosw *p)
560 {
561         struct list_head *lh;
562         struct inet_protosw *answer;
563         struct list_head *last_perm;
564         int protocol = p->protocol;
565         int ret;
566
567         spin_lock_bh(&inetsw6_lock);
568
569         ret = -EINVAL;
570         if (p->type >= SOCK_MAX)
571                 goto out_illegal;
572
573         /* If we are trying to override a permanent protocol, bail. */
574         answer = NULL;
575         ret = -EPERM;
576         last_perm = &inetsw6[p->type];
577         list_for_each(lh, &inetsw6[p->type]) {
578                 answer = list_entry(lh, struct inet_protosw, list);
579
580                 /* Check only the non-wild match. */
581                 if (INET_PROTOSW_PERMANENT & answer->flags) {
582                         if (protocol == answer->protocol)
583                                 break;
584                         last_perm = lh;
585                 }
586
587                 answer = NULL;
588         }
589         if (answer)
590                 goto out_permanent;
591
592         /* Add the new entry after the last permanent entry if any, so that
593          * the new entry does not override a permanent entry when matched with
594          * a wild-card protocol. But it is allowed to override any existing
595          * non-permanent entry.  This means that when we remove this entry, the
596          * system automatically returns to the old behavior.
597          */
598         list_add_rcu(&p->list, last_perm);
599         ret = 0;
600 out:
601         spin_unlock_bh(&inetsw6_lock);
602         return ret;
603
604 out_permanent:
605         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
606                protocol);
607         goto out;
608
609 out_illegal:
610         printk(KERN_ERR
611                "Ignoring attempt to register invalid socket type %d.\n",
612                p->type);
613         goto out;
614 }
615
616 EXPORT_SYMBOL(inet6_register_protosw);
617
618 void
619 inet6_unregister_protosw(struct inet_protosw *p)
620 {
621         if (INET_PROTOSW_PERMANENT & p->flags) {
622                 printk(KERN_ERR
623                        "Attempt to unregister permanent protocol %d.\n",
624                        p->protocol);
625         } else {
626                 spin_lock_bh(&inetsw6_lock);
627                 list_del_rcu(&p->list);
628                 spin_unlock_bh(&inetsw6_lock);
629
630                 synchronize_net();
631         }
632 }
633
634 EXPORT_SYMBOL(inet6_unregister_protosw);
635
636 int inet6_sk_rebuild_header(struct sock *sk)
637 {
638         int err;
639         struct dst_entry *dst;
640         struct ipv6_pinfo *np = inet6_sk(sk);
641
642         dst = __sk_dst_check(sk, np->dst_cookie);
643
644         if (dst == NULL) {
645                 struct inet_sock *inet = inet_sk(sk);
646                 struct in6_addr *final_p = NULL, final;
647                 struct flowi fl;
648
649                 memset(&fl, 0, sizeof(fl));
650                 fl.proto = sk->sk_protocol;
651                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
652                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
653                 fl.fl6_flowlabel = np->flow_label;
654                 fl.oif = sk->sk_bound_dev_if;
655                 fl.fl_ip_dport = inet->dport;
656                 fl.fl_ip_sport = inet->sport;
657                 security_sk_classify_flow(sk, &fl);
658
659                 if (np->opt && np->opt->srcrt) {
660                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
661                         ipv6_addr_copy(&final, &fl.fl6_dst);
662                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
663                         final_p = &final;
664                 }
665
666                 err = ip6_dst_lookup(sk, &dst, &fl);
667                 if (err) {
668                         sk->sk_route_caps = 0;
669                         return err;
670                 }
671                 if (final_p)
672                         ipv6_addr_copy(&fl.fl6_dst, final_p);
673
674                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
675                         sk->sk_err_soft = -err;
676                         return err;
677                 }
678
679                 __ip6_dst_store(sk, dst, NULL, NULL);
680         }
681
682         return 0;
683 }
684
685 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
686
687 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
688 {
689         struct ipv6_pinfo *np = inet6_sk(sk);
690         struct inet6_skb_parm *opt = IP6CB(skb);
691
692         if (np->rxopt.all) {
693                 if ((opt->hop && (np->rxopt.bits.hopopts ||
694                                   np->rxopt.bits.ohopopts)) ||
695                     ((IPV6_FLOWINFO_MASK &
696                       *(__be32 *)skb_network_header(skb)) &&
697                      np->rxopt.bits.rxflow) ||
698                     (opt->srcrt && (np->rxopt.bits.srcrt ||
699                      np->rxopt.bits.osrcrt)) ||
700                     ((opt->dst1 || opt->dst0) &&
701                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
702                         return 1;
703         }
704         return 0;
705 }
706
707 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
708
709 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
710 {
711         struct inet6_protocol *ops = NULL;
712
713         for (;;) {
714                 struct ipv6_opt_hdr *opth;
715                 int len;
716
717                 if (proto != NEXTHDR_HOP) {
718                         ops = rcu_dereference(inet6_protos[proto]);
719
720                         if (unlikely(!ops))
721                                 break;
722
723                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
724                                 break;
725                 }
726
727                 if (unlikely(!pskb_may_pull(skb, 8)))
728                         break;
729
730                 opth = (void *)skb->data;
731                 len = ipv6_optlen(opth);
732
733                 if (unlikely(!pskb_may_pull(skb, len)))
734                         break;
735
736                 proto = opth->nexthdr;
737                 __skb_pull(skb, len);
738         }
739
740         return proto;
741 }
742
743 static int ipv6_gso_send_check(struct sk_buff *skb)
744 {
745         struct ipv6hdr *ipv6h;
746         struct inet6_protocol *ops;
747         int err = -EINVAL;
748
749         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
750                 goto out;
751
752         ipv6h = ipv6_hdr(skb);
753         __skb_pull(skb, sizeof(*ipv6h));
754         err = -EPROTONOSUPPORT;
755
756         rcu_read_lock();
757         ops = rcu_dereference(inet6_protos[
758                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
759
760         if (likely(ops && ops->gso_send_check)) {
761                 skb_reset_transport_header(skb);
762                 err = ops->gso_send_check(skb);
763         }
764         rcu_read_unlock();
765
766 out:
767         return err;
768 }
769
770 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
771 {
772         struct sk_buff *segs = ERR_PTR(-EINVAL);
773         struct ipv6hdr *ipv6h;
774         struct inet6_protocol *ops;
775
776         if (!(features & NETIF_F_V6_CSUM))
777                 features &= ~NETIF_F_SG;
778
779         if (unlikely(skb_shinfo(skb)->gso_type &
780                      ~(SKB_GSO_UDP |
781                        SKB_GSO_DODGY |
782                        SKB_GSO_TCP_ECN |
783                        SKB_GSO_TCPV6 |
784                        0)))
785                 goto out;
786
787         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
788                 goto out;
789
790         ipv6h = ipv6_hdr(skb);
791         __skb_pull(skb, sizeof(*ipv6h));
792         segs = ERR_PTR(-EPROTONOSUPPORT);
793
794         rcu_read_lock();
795         ops = rcu_dereference(inet6_protos[
796                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
797
798         if (likely(ops && ops->gso_segment)) {
799                 skb_reset_transport_header(skb);
800                 segs = ops->gso_segment(skb, features);
801         }
802         rcu_read_unlock();
803
804         if (unlikely(IS_ERR(segs)))
805                 goto out;
806
807         for (skb = segs; skb; skb = skb->next) {
808                 ipv6h = ipv6_hdr(skb);
809                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
810                                            sizeof(*ipv6h));
811         }
812
813 out:
814         return segs;
815 }
816
817 struct ipv6_gro_cb {
818         struct napi_gro_cb napi;
819         int proto;
820 };
821
822 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
823
824 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
825                                          struct sk_buff *skb)
826 {
827         struct inet6_protocol *ops;
828         struct sk_buff **pp = NULL;
829         struct sk_buff *p;
830         struct ipv6hdr *iph;
831         unsigned int nlen;
832         unsigned int hlen;
833         unsigned int off;
834         int flush = 1;
835         int proto;
836         __wsum csum;
837
838         off = skb_gro_offset(skb);
839         hlen = off + sizeof(*iph);
840         iph = skb_gro_header_fast(skb, off);
841         if (skb_gro_header_hard(skb, hlen)) {
842                 iph = skb_gro_header_slow(skb, hlen, off);
843                 if (unlikely(!iph))
844                         goto out;
845         }
846
847         skb_gro_pull(skb, sizeof(*iph));
848         skb_set_transport_header(skb, skb_gro_offset(skb));
849
850         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
851
852         rcu_read_lock();
853         proto = iph->nexthdr;
854         ops = rcu_dereference(inet6_protos[proto]);
855         if (!ops || !ops->gro_receive) {
856                 __pskb_pull(skb, skb_gro_offset(skb));
857                 proto = ipv6_gso_pull_exthdrs(skb, proto);
858                 skb_gro_pull(skb, -skb_transport_offset(skb));
859                 skb_reset_transport_header(skb);
860                 __skb_push(skb, skb_gro_offset(skb));
861
862                 if (!ops || !ops->gro_receive)
863                         goto out_unlock;
864
865                 iph = ipv6_hdr(skb);
866         }
867
868         IPV6_GRO_CB(skb)->proto = proto;
869
870         flush--;
871         nlen = skb_network_header_len(skb);
872
873         for (p = *head; p; p = p->next) {
874                 struct ipv6hdr *iph2;
875
876                 if (!NAPI_GRO_CB(p)->same_flow)
877                         continue;
878
879                 iph2 = ipv6_hdr(p);
880
881                 /* All fields must match except length. */
882                 if (nlen != skb_network_header_len(p) ||
883                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
884                     memcmp(&iph->nexthdr, &iph2->nexthdr,
885                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
886                         NAPI_GRO_CB(p)->same_flow = 0;
887                         continue;
888                 }
889
890                 NAPI_GRO_CB(p)->flush |= flush;
891         }
892
893         NAPI_GRO_CB(skb)->flush |= flush;
894
895         csum = skb->csum;
896         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
897
898         pp = ops->gro_receive(head, skb);
899
900         skb->csum = csum;
901
902 out_unlock:
903         rcu_read_unlock();
904
905 out:
906         NAPI_GRO_CB(skb)->flush |= flush;
907
908         return pp;
909 }
910
911 static int ipv6_gro_complete(struct sk_buff *skb)
912 {
913         struct inet6_protocol *ops;
914         struct ipv6hdr *iph = ipv6_hdr(skb);
915         int err = -ENOSYS;
916
917         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
918                                  sizeof(*iph));
919
920         rcu_read_lock();
921         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
922         if (WARN_ON(!ops || !ops->gro_complete))
923                 goto out_unlock;
924
925         err = ops->gro_complete(skb);
926
927 out_unlock:
928         rcu_read_unlock();
929
930         return err;
931 }
932
933 static struct packet_type ipv6_packet_type __read_mostly = {
934         .type = cpu_to_be16(ETH_P_IPV6),
935         .func = ipv6_rcv,
936         .gso_send_check = ipv6_gso_send_check,
937         .gso_segment = ipv6_gso_segment,
938         .gro_receive = ipv6_gro_receive,
939         .gro_complete = ipv6_gro_complete,
940 };
941
942 static int __init ipv6_packet_init(void)
943 {
944         dev_add_pack(&ipv6_packet_type);
945         return 0;
946 }
947
948 static void ipv6_packet_cleanup(void)
949 {
950         dev_remove_pack(&ipv6_packet_type);
951 }
952
953 static int __net_init ipv6_init_mibs(struct net *net)
954 {
955         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
956                           sizeof (struct udp_mib)) < 0)
957                 return -ENOMEM;
958         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
959                           sizeof (struct udp_mib)) < 0)
960                 goto err_udplite_mib;
961         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
962                           sizeof(struct ipstats_mib)) < 0)
963                 goto err_ip_mib;
964         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
965                           sizeof(struct icmpv6_mib)) < 0)
966                 goto err_icmp_mib;
967         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
968                           sizeof(struct icmpv6msg_mib)) < 0)
969                 goto err_icmpmsg_mib;
970         return 0;
971
972 err_icmpmsg_mib:
973         snmp_mib_free((void **)net->mib.icmpv6_statistics);
974 err_icmp_mib:
975         snmp_mib_free((void **)net->mib.ipv6_statistics);
976 err_ip_mib:
977         snmp_mib_free((void **)net->mib.udplite_stats_in6);
978 err_udplite_mib:
979         snmp_mib_free((void **)net->mib.udp_stats_in6);
980         return -ENOMEM;
981 }
982
983 static void __net_exit ipv6_cleanup_mibs(struct net *net)
984 {
985         snmp_mib_free((void **)net->mib.udp_stats_in6);
986         snmp_mib_free((void **)net->mib.udplite_stats_in6);
987         snmp_mib_free((void **)net->mib.ipv6_statistics);
988         snmp_mib_free((void **)net->mib.icmpv6_statistics);
989         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
990 }
991
992 static int __net_init inet6_net_init(struct net *net)
993 {
994         int err = 0;
995
996         net->ipv6.sysctl.bindv6only = 0;
997         net->ipv6.sysctl.icmpv6_time = 1*HZ;
998
999         err = ipv6_init_mibs(net);
1000         if (err)
1001                 return err;
1002 #ifdef CONFIG_PROC_FS
1003         err = udp6_proc_init(net);
1004         if (err)
1005                 goto out;
1006         err = tcp6_proc_init(net);
1007         if (err)
1008                 goto proc_tcp6_fail;
1009         err = ac6_proc_init(net);
1010         if (err)
1011                 goto proc_ac6_fail;
1012 #endif
1013         return err;
1014
1015 #ifdef CONFIG_PROC_FS
1016 proc_ac6_fail:
1017         tcp6_proc_exit(net);
1018 proc_tcp6_fail:
1019         udp6_proc_exit(net);
1020 out:
1021         ipv6_cleanup_mibs(net);
1022         return err;
1023 #endif
1024 }
1025
1026 static void inet6_net_exit(struct net *net)
1027 {
1028 #ifdef CONFIG_PROC_FS
1029         udp6_proc_exit(net);
1030         tcp6_proc_exit(net);
1031         ac6_proc_exit(net);
1032 #endif
1033         ipv6_cleanup_mibs(net);
1034 }
1035
1036 static struct pernet_operations inet6_net_ops = {
1037         .init = inet6_net_init,
1038         .exit = inet6_net_exit,
1039 };
1040
1041 static int __init inet6_init(void)
1042 {
1043         struct sk_buff *dummy_skb;
1044         struct list_head *r;
1045         int err = 0;
1046
1047         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1048
1049         /* Register the socket-side information for inet6_create.  */
1050         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1051                 INIT_LIST_HEAD(r);
1052
1053         if (disable_ipv6_mod) {
1054                 printk(KERN_INFO
1055                        "IPv6: Loaded, but administratively disabled, "
1056                        "reboot required to enable\n");
1057                 goto out;
1058         }
1059
1060         err = proto_register(&tcpv6_prot, 1);
1061         if (err)
1062                 goto out;
1063
1064         err = proto_register(&udpv6_prot, 1);
1065         if (err)
1066                 goto out_unregister_tcp_proto;
1067
1068         err = proto_register(&udplitev6_prot, 1);
1069         if (err)
1070                 goto out_unregister_udp_proto;
1071
1072         err = proto_register(&rawv6_prot, 1);
1073         if (err)
1074                 goto out_unregister_udplite_proto;
1075
1076
1077         /* We MUST register RAW sockets before we create the ICMP6,
1078          * IGMP6, or NDISC control sockets.
1079          */
1080         err = rawv6_init();
1081         if (err)
1082                 goto out_unregister_raw_proto;
1083
1084         /* Register the family here so that the init calls below will
1085          * be able to create sockets. (?? is this dangerous ??)
1086          */
1087         err = sock_register(&inet6_family_ops);
1088         if (err)
1089                 goto out_sock_register_fail;
1090
1091 #ifdef CONFIG_SYSCTL
1092         err = ipv6_static_sysctl_register();
1093         if (err)
1094                 goto static_sysctl_fail;
1095 #endif
1096         /*
1097          *      ipngwg API draft makes clear that the correct semantics
1098          *      for TCP and UDP is to consider one TCP and UDP instance
1099          *      in a host availiable by both INET and INET6 APIs and
1100          *      able to communicate via both network protocols.
1101          */
1102
1103         err = register_pernet_subsys(&inet6_net_ops);
1104         if (err)
1105                 goto register_pernet_fail;
1106         err = icmpv6_init();
1107         if (err)
1108                 goto icmp_fail;
1109         err = ip6_mr_init();
1110         if (err)
1111                 goto ipmr_fail;
1112         err = ndisc_init();
1113         if (err)
1114                 goto ndisc_fail;
1115         err = igmp6_init();
1116         if (err)
1117                 goto igmp_fail;
1118         err = ipv6_netfilter_init();
1119         if (err)
1120                 goto netfilter_fail;
1121         /* Create /proc/foo6 entries. */
1122 #ifdef CONFIG_PROC_FS
1123         err = -ENOMEM;
1124         if (raw6_proc_init())
1125                 goto proc_raw6_fail;
1126         if (udplite6_proc_init())
1127                 goto proc_udplite6_fail;
1128         if (ipv6_misc_proc_init())
1129                 goto proc_misc6_fail;
1130         if (if6_proc_init())
1131                 goto proc_if6_fail;
1132 #endif
1133         err = ip6_route_init();
1134         if (err)
1135                 goto ip6_route_fail;
1136         err = ip6_flowlabel_init();
1137         if (err)
1138                 goto ip6_flowlabel_fail;
1139         err = addrconf_init();
1140         if (err)
1141                 goto addrconf_fail;
1142
1143         /* Init v6 extension headers. */
1144         err = ipv6_exthdrs_init();
1145         if (err)
1146                 goto ipv6_exthdrs_fail;
1147
1148         err = ipv6_frag_init();
1149         if (err)
1150                 goto ipv6_frag_fail;
1151
1152         /* Init v6 transport protocols. */
1153         err = udpv6_init();
1154         if (err)
1155                 goto udpv6_fail;
1156
1157         err = udplitev6_init();
1158         if (err)
1159                 goto udplitev6_fail;
1160
1161         err = tcpv6_init();
1162         if (err)
1163                 goto tcpv6_fail;
1164
1165         err = ipv6_packet_init();
1166         if (err)
1167                 goto ipv6_packet_fail;
1168
1169 #ifdef CONFIG_SYSCTL
1170         err = ipv6_sysctl_register();
1171         if (err)
1172                 goto sysctl_fail;
1173 #endif
1174 out:
1175         return err;
1176
1177 #ifdef CONFIG_SYSCTL
1178 sysctl_fail:
1179         ipv6_packet_cleanup();
1180 #endif
1181 ipv6_packet_fail:
1182         tcpv6_exit();
1183 tcpv6_fail:
1184         udplitev6_exit();
1185 udplitev6_fail:
1186         udpv6_exit();
1187 udpv6_fail:
1188         ipv6_frag_exit();
1189 ipv6_frag_fail:
1190         ipv6_exthdrs_exit();
1191 ipv6_exthdrs_fail:
1192         addrconf_cleanup();
1193 addrconf_fail:
1194         ip6_flowlabel_cleanup();
1195 ip6_flowlabel_fail:
1196         ip6_route_cleanup();
1197 ip6_route_fail:
1198 #ifdef CONFIG_PROC_FS
1199         if6_proc_exit();
1200 proc_if6_fail:
1201         ipv6_misc_proc_exit();
1202 proc_misc6_fail:
1203         udplite6_proc_exit();
1204 proc_udplite6_fail:
1205         raw6_proc_exit();
1206 proc_raw6_fail:
1207 #endif
1208         ipv6_netfilter_fini();
1209 netfilter_fail:
1210         igmp6_cleanup();
1211 igmp_fail:
1212         ndisc_cleanup();
1213 ndisc_fail:
1214         ip6_mr_cleanup();
1215 ipmr_fail:
1216         icmpv6_cleanup();
1217 icmp_fail:
1218         unregister_pernet_subsys(&inet6_net_ops);
1219 register_pernet_fail:
1220 #ifdef CONFIG_SYSCTL
1221         ipv6_static_sysctl_unregister();
1222 static_sysctl_fail:
1223 #endif
1224         sock_unregister(PF_INET6);
1225         rtnl_unregister_all(PF_INET6);
1226 out_sock_register_fail:
1227         rawv6_exit();
1228 out_unregister_raw_proto:
1229         proto_unregister(&rawv6_prot);
1230 out_unregister_udplite_proto:
1231         proto_unregister(&udplitev6_prot);
1232 out_unregister_udp_proto:
1233         proto_unregister(&udpv6_prot);
1234 out_unregister_tcp_proto:
1235         proto_unregister(&tcpv6_prot);
1236         goto out;
1237 }
1238 module_init(inet6_init);
1239
1240 static void __exit inet6_exit(void)
1241 {
1242         if (disable_ipv6_mod)
1243                 return;
1244
1245         /* First of all disallow new sockets creation. */
1246         sock_unregister(PF_INET6);
1247         /* Disallow any further netlink messages */
1248         rtnl_unregister_all(PF_INET6);
1249
1250 #ifdef CONFIG_SYSCTL
1251         ipv6_sysctl_unregister();
1252 #endif
1253         udpv6_exit();
1254         udplitev6_exit();
1255         tcpv6_exit();
1256
1257         /* Cleanup code parts. */
1258         ipv6_packet_cleanup();
1259         ipv6_frag_exit();
1260         ipv6_exthdrs_exit();
1261         addrconf_cleanup();
1262         ip6_flowlabel_cleanup();
1263         ip6_route_cleanup();
1264 #ifdef CONFIG_PROC_FS
1265
1266         /* Cleanup code parts. */
1267         if6_proc_exit();
1268         ipv6_misc_proc_exit();
1269         udplite6_proc_exit();
1270         raw6_proc_exit();
1271 #endif
1272         ipv6_netfilter_fini();
1273         igmp6_cleanup();
1274         ndisc_cleanup();
1275         ip6_mr_cleanup();
1276         icmpv6_cleanup();
1277         rawv6_exit();
1278
1279         unregister_pernet_subsys(&inet6_net_ops);
1280 #ifdef CONFIG_SYSCTL
1281         ipv6_static_sysctl_unregister();
1282 #endif
1283         proto_unregister(&rawv6_prot);
1284         proto_unregister(&udplitev6_prot);
1285         proto_unregister(&udpv6_prot);
1286         proto_unregister(&tcpv6_prot);
1287 }
1288 module_exit(inet6_exit);
1289
1290 MODULE_ALIAS_NETPROTO(PF_INET6);